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Estimation Method of Slope Surface Roughness and Soil Moisture Absorption Rate under Rainfall Conditions

A moisture absorption rate and soil technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as difficult to quickly and accurately determine surface roughness and soil moisture absorption rate

Inactive Publication Date: 2018-05-29
XIAN UNIV OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for estimating slope surface roughness and soil moisture absorption rate under rainfall conditions, which solves the problem that it is difficult to quickly and accurately determine surface roughness and soil moisture absorption rate under rainfall conditions in the prior art

Method used

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  • Estimation Method of Slope Surface Roughness and Soil Moisture Absorption Rate under Rainfall Conditions
  • Estimation Method of Slope Surface Roughness and Soil Moisture Absorption Rate under Rainfall Conditions
  • Estimation Method of Slope Surface Roughness and Soil Moisture Absorption Rate under Rainfall Conditions

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Embodiment Construction

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0060] The method for estimating slope surface roughness and soil moisture absorption rate under rainfall conditions of the present invention is specifically implemented according to the following steps:

[0061] Step 1, establish the motion wave equation

[0062] According to the water balance relationship under rainfall conditions, the motion wave equation is established, and the equation is:

[0063]

[0064] In formula (1), h is the depth of water flow on the slope / m, t is the water supply time / s, x is the distance between the water flow on the slope and the entrance / m, r is the rain intensity / m / s, and i is the infiltration rate / m / s, q is single width runoff / m 3 / (ms).

[0065] Step 2, the analytical method approximately solves the kinematic wave equation, and obtains the flow and water depth at different positions on the slope over ...

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Abstract

The invention discloses a method for estimating the surface roughness and soil moisture absorption rate of a slope under rainfall conditions. The movement process of water flow on a slope is described with the help of a kinematic wave equation, the kinematic wave equation is approximately solved by an analytical method to obtain the relation between changes in water flow and depth in different positions of the slope with time, and the surface roughness and soil moisture absorption rate are determined based on the change relation and observed data of rainfall. The method for estimating the surface roughness and soil moisture absorption rate of a slope under rainfall conditions is different from previous measurement methods which cause large error and have limitations. By using the method of the invention, as long as there is data of one rainfall, the volume of runoff at the exit is measured and a water balance equation is established based on a relational expression of changes in water flow and depth in different positions of the slope with time, the surface roughness and soil moisture absorption rate can be determined.

Description

technical field [0001] The invention belongs to the technical field of research on slope surface characteristics under rainfall conditions in hydrological process analysis, and specifically relates to an estimation method for slope surface roughness and soil moisture absorption rate under rainfall conditions. Background technique [0002] Surface roughness and soil moisture absorption rate are important parameters to describe the hydrological process and determine the hydraulic characteristics. Under rainfall conditions, due to the splashing of raindrops and the scouring of water flow, the surface roughness of the soil and the characteristics of soil infiltration will change. Changes in rainfall characteristics directly affect surface runoff, soil infiltration, overland flow, and soil erosion and nutrient transport processes. Usually, the kinetic wave equation is used to describe the movement process of slope water flow, and the methods for solving the kinetic wave equation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 王全九杨婷
Owner XIAN UNIV OF TECH
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